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3. Life Cycle of Small white butterfly<br />
Causes severe damage in spring (April to June) and<br />
autumn (Sep. to Oct.) in most parts of China. Or July to<br />
Aug. in colder areas, especially higher altitudes.<br />
Overwintered pupae come to eclosion in March in mid-<br />
downstream of Yellow River. Newly hatched larvae<br />
appear in April. Damage peaks from May to June.<br />
Population decreases from Jul. to Aug. It increases again<br />
in Sep. Then the second damage peak appears, which is<br />
less severe than the first.
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